package com.wzapp.sitposture.task.config.async;

import com.wzapp.sitposture.common.error.AsyncExceptionHandler;
import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * Created by Yuxiaguang on 2017/12/2.
 */
@Configuration
@EnableAsync
@ComponentScan({"com.wzapp.sitposture.task.service"})
public class AsyncTaskConfig implements AsyncConfigurer {

    /**
     * Set the ThreadPoolExecutor's core pool size.
     */
    private int corePoolSize = 5;
    /**
     * Set the ThreadPoolExecutor's maximum pool size.
     */
    private int maxPoolSize = 100;
    /**
     * Set the capacity for the ThreadPoolExecutor's BlockingQueue.
     */
    private int queueCapacity = 100;

    private String threadNamePrefix = "AsyncTaskExecutor-";

    @Override
    public Executor getAsyncExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(corePoolSize);
        executor.setMaxPoolSize(maxPoolSize);
        executor.setQueueCapacity(queueCapacity);
        executor.setThreadNamePrefix(threadNamePrefix);

        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        return executor;
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {

        return new AsyncExceptionHandler();
    }
}
